June Perry on sun 27 oct 02
if you like
Paul, I ran your rutile blue glaze through my Insight 5.0 Software and it's a
bit short of silica for C10 limit. If you just add 4.5 more silica to the
formula it will bring it up to C10 silica limit.
I also did a new formula, taking away some of the magnesia, and adding more
whiting and adding enough silica to get it up to C 10 limits. The old formula
as you posted has an expansion of 6.8 and a Silica:Alumina ration of 8.05.
The one I'm listing below has an expansion of 6.86 and a Silica:Alumina
ration of 8.71 making it a bit more glossy.
I've numbered it #8305V2 if you'd like to try it. I'm listing your version
with two others you may want to try. The B color version is the oxide
combinatin I use in my Moonlight rutile base.
As Craig mentioned the magnesia can form crystals in slow cooling and so can
the calcium. If you try it I'd love feedback on how it worked or didn't work
28.7 Custer Feldspar
A. Version ADD: 8% Rutile
B. Version ADD: 3.2 Rutile, Powdered Illmenite 2.0%
C. Version ADD: Rutile 4%, Yellow Ochre 3.5% (This combination on a white
body has given me a very intriguing glaze in some bases. On an iron bearing
body, it will probably go a blue/orange combination. You can check out my C10
recipes Group 1 page and Group 5 on my web page, to see this oxide
combination in two bases, one of which is the Moonlight base, to see an
example of this rutile/iron combination.
To get a good look you can copy the pictures of the tile group and paste it
into a free program like Paint Shop Pro, or a similar program and use the
magnifier to make it as large as you need to get a really close look at the